diff --git a/.isort.cfg b/.isort.cfg
new file mode 100644
index 0000000000..e1c6495da9
--- /dev/null
+++ b/.isort.cfg
@@ -0,0 +1,3 @@
+[settings]
+multi_line_output=4
+known_first_party=trytond
diff --git a/__init__.py b/__init__.py
index cd40ef6a0a..396d2ea91d 100644
--- a/__init__.py
+++ b/__init__.py
@@ -2,6 +2,7 @@
 # this repository contains the full copyright notices and license terms.
 
 from trytond.pool import Pool
+
 from . import stock
 
 __all__ = ['register']
diff --git a/setup.py b/setup.py
index b9f732cc9e..8b19a0a20b 100755
--- a/setup.py
+++ b/setup.py
@@ -6,7 +6,8 @@ import io
 import os
 import re
 from configparser import ConfigParser
-from setuptools import setup, find_packages
+
+from setuptools import find_packages, setup
 
 
 def read(fname):
diff --git a/stock.py b/stock.py
index d139213a15..9993fc31c9 100644
--- a/stock.py
+++ b/stock.py
@@ -1,11 +1,10 @@
 # This file is part of Tryton.  The COPYRIGHT file at the top level of
 # this repository contains the full copyright notices and license terms.
 from trytond.model import fields
-from trytond.pool import PoolMeta, Pool
-from trytond.pyson import Eval
-
 from trytond.modules.currency.fields import Monetary
 from trytond.modules.product import price_digits, round_price
+from trytond.pool import Pool, PoolMeta
+from trytond.pyson import Eval
 
 
 class Move(metaclass=PoolMeta):
diff --git a/tests/__init__.py b/tests/__init__.py
index 41a9c87a29..b7bd611a04 100644
--- a/tests/__init__.py
+++ b/tests/__init__.py
@@ -2,7 +2,8 @@
 # this repository contains the full copyright notices and license terms.
 
 try:
-    from trytond.modules.stock_secondary_unit.tests.test_stock_secondary_unit import suite  # noqa: E501
+    from trytond.modules.stock_secondary_unit.tests.test_stock_secondary_unit import \
+        suite  # noqa: E501
 except ImportError:
     from .test_stock_secondary_unit import suite
 
diff --git a/tests/test_stock_secondary_unit.py b/tests/test_stock_secondary_unit.py
index 1c0ab363db..6dc63915ac 100644
--- a/tests/test_stock_secondary_unit.py
+++ b/tests/test_stock_secondary_unit.py
@@ -3,7 +3,6 @@
 
 import unittest
 
-
 from trytond.tests.test_tryton import ModuleTestCase
 from trytond.tests.test_tryton import suite as test_suite